| 1 | ENTITY sff1_x4 IS
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| 2 | GENERIC (
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| 3 | CONSTANT area : NATURAL := 4500;
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| 4 | CONSTANT cin_ck : NATURAL := 8;
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| 5 | CONSTANT cin_i : NATURAL := 8;
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| 6 | CONSTANT rdown_ck_q : NATURAL := 800;
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| 7 | CONSTANT rup_ck_q : NATURAL := 890;
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| 8 | CONSTANT taf_ck_q : NATURAL := 500;
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| 9 | CONSTANT tar_ck_q : NATURAL := 500;
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| 10 | CONSTANT thf_i_ck : NATURAL := 0;
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| 11 | CONSTANT thr_i_ck : NATURAL := 0;
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| 12 | CONSTANT tsf_i_ck : NATURAL := 585;
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| 13 | CONSTANT tsr_i_ck : NATURAL := 476;
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| 14 | CONSTANT transistors : NATURAL := 26
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| 15 | );
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| 16 | PORT (
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| 17 | ck : in BIT;
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| 18 | i : in BIT;
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| 19 | q : out BIT;
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| 20 | vdd : in BIT;
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| 21 | vss : in BIT
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| 22 | );
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| 23 | END sff1_x4;
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| 24 |
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| 25 | ARCHITECTURE VBE OF sff1_x4 IS
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| 26 | SIGNAL sff_m : REG_BIT REGISTER;
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| 27 |
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| 28 | BEGIN
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| 29 | ASSERT (vdd and not (vss))
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| 30 | REPORT "power supply is missing on sff1_x4"
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| 31 | SEVERITY WARNING;
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| 32 |
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| 33 | label0 : BLOCK ((ck and not (ck'STABLE)) = '1')
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| 34 | BEGIN
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| 35 | sff_m <= GUARDED i;
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| 36 | END BLOCK label0;
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| 37 |
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| 38 | q <= sff_m after 1700 ps;
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| 39 | END;
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